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Store app missing with all other windows store apps

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Sme:
My store app and all other apps aren't showing in start menu although they open when i open any program such as photos. when using following instructions in powershell:

1. reg delete "HKCU\Software\Microsoft\Windows NT\CurrentVersion\TileDataModel\Migration\TileStore" /va /f
2. get-appxpackage -packageType bundle |% {add-appxpackage -register -disabledevelopmentmode ($_.installlocation + "\appxmetadata\appxbundlemanifest.xml")}
$bundlefamilies = (get-appxpackage -packagetype Bundle).packagefamilyname
3. get-appxpackage -packagetype main |? {-not ($bundlefamilies -contains $_.packagefamilyname)} |% {add-appxpackage -register -disabledevelopmentmode ($_.installlocation + "\appxmanifest.xml")}

it shows-

get-appxpackage : The database disk image is malformed
The database disk image is malformed
At line:1 char:1
+ get-appxpackage -packageType bundle |% {add-appxpackage -register -di ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Get-AppxPackage], Exception
+ FullyQualifiedErrorId : System.Exception,Microsoft.Windows.Appx.PackageManager.Commands.GetAppxPackageCommand

I tried using DISM but it stops at 82% with error 1392 saying a file is corrupted and unreadable.
I also upgraded windows twice to newer builds but it ended in black with a cursor. I tried opening task manager with Alt+Ctrl+Del but it wont open so i had to revert to previous build.

Please help.

Boggin:
It's CTRL+ALT+DEL to open Task Manager.

I'd probably go for a repair install for this which won't affect your personal stuff or installed programs.

You will need to create a Win 10 install disk or USB if you don't already have one which you can do at http://windowsiso.net/

Hover over the Win 10 ISO tab then hover over the version for your version then click on Standard where you get the option for 32 or 64 bit.

Select Save on the download then use https://www.microsoft.com/en-us/download/details.aspx?id=56485 to create a bootable DVD or USB.

To perform a repair install, with the machine booted up, open Windows Explorer - This PC - insert the install media and double click on its drive.

This will start the process if using a DVD but will open to its files when using an USB, where you would then double click on setup Application.

This takes a little over 3hrs on my Win 10 Home x64 and reverts the apps to default and may turn off System Protection which you will then need to turn back on.

It may be that some of your drivers are out of date that is causing the black screen on updating versions.

It may be that Windows can find updated drivers for you but generally you may need to go to the driver vendor's site, except in the case of Nvidia graphics, as they can be OEM modified if you are using an OEM branded machine.

To see if Windows can find any, go into Device Manager/View/Show hidden devices then work your way through each section by right clicking on the items and selecting Update Driver.

It could be a graphics driver that needs updating or one of the items in System devices.

Sme:
Thanks for replying.
I tried open task manager when the black screen appeared but it still showd a black screen. Also the safe mode resulted in a hang.
All my drivers are shown up to date.
I dont want to reset my pc. just want bring back store and windows apps. What should i do?

Boggin:
You need to be able to get into Windows first.

Booting up with install media will enable you to check if you have any restore points you can use.

How did you manage to access safe mode from a black screen ?

Sme:
Actually when i pressed ALT+CTRL+DEL i got the power icon, i pressed Shift+Restart to get to safe mode. However i wasnt able to do anything there as well. Hence i reverted to previous build. Now i can boot successfully, all is good except the store and windows apps.

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